Constant Loose Stools And Diarrhea, Lower Abdominal Pain, Nausea. Normal Test Results. Remedy?

Hello, I have had constant loose stools and diariah for the past five months, within the past week ive had extreme lower abdoman pain it starts as soon as i wake up and doesn't go away until I either take demerol or fall back asleep, I have naseau sometimes to the point of almost puking.. sometimes there is mucus in my stool but no blood. The abdoman pain is very severe and is affecting every asect of my life. Also they have done every blood test possible, stoopl cultural, chest xray, abdominal ultrasound..and urine test...also the bottom of my throat sort of hurts..